COOK CP - Manual (Page 8)

8
After 24 hours of operation, retighten the setscrews to
the appropriate torque. This assures full locking of the inner
race to the shaft. Make sure the socket key or driver is in
good condition with no rounded corners. The key should be
fully engaged in the setscrew and held squarely to prevent
rounding out of the setscrew socket when applying
maximum torque.
For Arrangement 3: Bearings should be replaced
individually for each side of fan.
1. Loosen and remove belts.
2. If replacing drive side bearing, mark location of pulley
and then remove.
3. Mark bearing location on bearing support and loosen
bearing hold down bolts.
4. Support shaft to remove weight from bearing.
5. Remove anti-corrosion coating from the shaft with a
suitable de-greaser.
6. Remove bearing from the shaft using a bearing puller.
If a bearing puller is not available, tap on the bearing
with a wood block and hammer to remove it.
7. Smooth and clean the shaft and bearing bore
thoroughly.
8. Place the bearing into position making sure it is not on
a worn section of the shaft. Tapping the inner ring face
with a soft driver may be required. Do not hammer on
the housing.
9. The outer ring of the bearing is spherical and swivels
in the housing to compensate for misalignment.
Secure hold-down bolts, but do not fully tighten.
10. Align setscrews on the bearings and tighten one
setscrew on bearing.
11. Rotate the shaft to allow the bearing outer ring to find
its center of free movement.
12. Tighten hold-down bolts to proper torque. Refer to
Torque chart.
13. Turn the shaft by hand. Resistance should be the
same as it was before hold-down bolts were fully
tightened.
14. Tighten bearing setscrews to specified torque.
15. Re-install the pulley if required.
16. Repeat process for opposite bearing.
17. Adjust the belt tension.
18. Test run and retighten all setscrews and bolts; trim
balance as necessary (.0785 in/sec max.).
After 24 hours of operation, retighten the setscrews to
the appropriate torque. This assures full locking of the
inner race to the shaft. Make sure the socket key or
driver is in good condition with no rounded corners. The
key should be fully engaged in the setscrew and held
squarely to prevent rounding out of the setscrew socket
when applying maximum torque.
Pulley and Belt Replacement
1. Remove pulleys from their respective shafts.
2. Clean the motor and fan shafts.
3. Clean bores of pulleys and coat the bores with
heavy oil.
4. Remove grease, rust, or burrs from the pulleys and
shafts.
5. Remove burrs from shaft by sanding.
6. Place fan pulley on fan shaft and motor pulley on its
shaft. Damage to the pulleys can occur when
excessive force is used in placing the pulleys on
their respective shafts.
7. Tighten in place.
8. Install belts on pulleys and align as described in the
Belt and Pulley Installation section.
Bearing Replacement
The fan bearings are pillow block ball bearings.
An emery cloth or file may be needed to remove
imperfections in the shaft left by the setscrews.
For Arrangement 1,2, 9 and 10:
1. Mark the position on the shaft of both bearing races,
setscrews, and the wheel and pulley. Mark the
location and orientation of the inlet cone. Note the
clearance between the wheel and inlet cone.
2. Remove the fan pulley.
3. Remove the inlet cone.d. Remove the wheel from
the shaft. A 2-jaw puller may be needed.
4. Remove bearing hold-down bolts. Remove shaft
and bearings as one unit.
5. Remove the anti-corrosion coating from the shaft
with a suitable degreaser.
6. Remove the bearing from the shaft using a bearing
puller. If a bearing puller is not available, tap on the
bearing with a wood block and hammer to remove it.
7. Smooth and clean the shaft and bearing bore
thoroughly.
8. Place the bearings into position making sure they
are not on a worn section of the shaft. Tapping the
inner ring face with a soft driver may be required.
NOTICE! Do not hammer on the housing.
9. The outer ring of the bearing is spherical and
swivels in the housing to compensate for
misalignment. Secure hold-down bolts, but do not
fully tighten.
10. Align the setscrews on the bearings and tighten
one setscrew on each bearing.
11. Rotate the shaft to allow the bearing outer rings to
find their center of free movement.
12. Install the wheel on the shaft. Install the inlet cone
in its original location. And adjust bearing position
and inlet cone to center the wheel in the inlet cone.
13. Tighten hold-down bolts to proper torque.
14. Turn the shaft by hand. Resistance should be the
same as it was before hold-down bolts were fully
tightened.
15. Tighten bearing setscrews to specified torque.
Refer to the Torque chart.
16. Re-install the pulley and adjust the belt tension.
17. Test run and retighten all setscrews and bolts; trim
balance as necessary (.0785 in/sec max.).